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Recent questions tagged states-of-matter

Classify the following solid as ionic, metallic, molecular, network (covalent) or amorphous.Tetra phosphorus decoxide $(P_4O_{10})$

asked Jul 29, 2014 by sreemathi.v

1 answer

What makes a glass different from a solid such as quartz? Under what conditions could quartz be converted into glass?

asked Jul 29, 2014 by sreemathi.v

1 answer

Define the term 'amorphous'. Give a few examples of amorphous solids.

asked Jul 29, 2014 by sreemathi.v

1 answer

A metal crystallises into two cubic phases,face centred cubic (FCC) and body centred cubic (BCC),whose unit cell length are 3.5 and $3.0A^{\large\circ}$,respectively.Calculate the ratio of densities of FCC and BCC.

asked Jul 17, 2014 by sreemathi.v

1 answer

Chromium metal crystallises witha body-centred cubic lattice.The length of the unit cell edge is found to be 287pm.Calculate the atomic radius.What would be the density of chromium in $g/cm^3$?

asked Jul 17, 2014 by sreemathi.v

1 answer

A unit cell of sodium chloride has four formula units.The edge length of the unit cell is 0.564nm.What is the density of sodium chloride?

asked Jul 17, 2014 by sreemathi.v

1 answer

A sample of wustite $Fe_xO$ contains one Fe(III) for every three Fe(II).Calculate the value of $x$

asked Jul 16, 2014 by sreemathi.v

1 answer

LiI occurs as cubical-closest packing.If the edge length of a unit cell is 624 pm,determine the ionic radii of $Li^+$ and $I^-$ ions.

asked Jul 16, 2014 by sreemathi.v

1 answer

$KCl$ crystallizes in the same type of lattice as does $NaCl$.Givn that $\large\frac{r_{Na^+}}{r_{Cl^-}}$$=0.5$ and $\large\frac{r_{Na^+}}{r_{K^+}}$$=0.7$.Calculate the ratio of the side unit cell for $KCl$ to that for $NaCl$,and the ratio of density of $NaCl$ to that of $KCl$

asked Jul 16, 2014 by sreemathi.v

1 answer

If the radius of $Cs^+$ is 169pm and that of $Cl^-$ is 181pm,predict the structure of CsCl.What is the coordination number of $Cs^+$ ion?

asked Jul 16, 2014 by sreemathi.v

1 answer

A solid $A^+B^-$ has an NaCl type closest packed structure.If the radius of the anion is 250pm,what is the radius of the cation?

asked Jul 16, 2014 by sreemathi.v

1 answer

The atomic radius of strontium is 215pm and it crystallizes with a cubical closest-packed structure.Calculate the density of strontium.The molar mass of strontium is $87.6gmol^{-1}$.

asked Jul 16, 2014 by sreemathi.v

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals.The edge length of unit cell is 412pm.Determine the ionic radius of $Cs^+$ if the ionic radius of $Cl^-$ is 181pm.Given :M(Cs)=$133gmol^{-1}$

asked Jul 16, 2014 by sreemathi.v

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals.The edge length of unit cell is 412pm.Determine the density of CsCl.Given :M(Cs)=$133gmol^{-1}$

asked Jul 16, 2014 by sreemathi.v

1 answer

The edge length of a cubic unit cell of metallic calcium is 556pm.If the density of calcium is $1.54gcm^{-3}$ and its molar mass is $40.08gmol^{-1}$,calculate the radius of calcium atom

asked Jul 16, 2014 by sreemathi.v

1 answer

Calculate the radius of molybdenum atom if the element crystallizes as body-centred cubic crystals.Given : Density of $Mo=10.3gcm^{-3}$ and molar mass of $Mo=95.94gmol^{-1}$ .

asked Jul 16, 2014 by sreemathi.v

1 answer

Which of the following statements are correct?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

Find out the ratio of the mole-fraction of the Frenkel’s defect in $NaCl$ crystal at $4000\;K$ temperature. The amount of energy needed to form Frenkel’s defects and Schottky defects are respectively $2\;eV$ and $4\;eV$.

asked Jul 15, 2014 by balaji.thirumalai

1 answer

Which of the following statements is incorrect?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

Which of the following statements is incorrect?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces. If side length is 10$A^{\large\circ}$, what is the density of the solid assuming atomic weights of A and B as 50 and 100 gms respectively.

asked Jul 15, 2014 by balaji.thirumalai

1 answer

A metal crystallizes in two cubic phases FCC and BCC with unit length equal to 350 pm and 300 pm. The ratio of densities of FCC and BCC is about?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

A substance which has a face centered cubic crystal has a density of 1.984 gcm$^{-3}$ and the edge length of the unit cell equal to 630 ppm. What is the molar mass of the substance?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The cubic unit cell of aluminium has an edge length of 405 pm. If its density is 2.7 gcm$^{-3}$, what is the type of unit cell? (Note: Molar mass = 27 g/mol)

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The unit cell length of sodium chloride crystal is 564 pm. What is its density?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The fraction of volume occupied in a diamond shaped cubic cell is:

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The fraction of volume occupied in a face centric cubic cell is:

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The fraction of volume occupied in a body centric cubic cell is:

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The fraction of volume occupied in a primitive cubic cell is:

asked Jul 15, 2014 by balaji.thirumalai

1 answer

What is the total number of atoms in a cubic based unit cell having one atom on each corner and two atoms on each diagonal?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

In a ccp of mixed oxide, it is found that lattice has $O^{2-}$ ions and one half of the octahedral voids are occupied by trivalent cataions ($X^{3+}$) and one eight of the tetrahedral voids by divalent cataions ($Y^{2+}$). What is the formula of the mixed oxide?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

A compound is formed by 2 elements M and N. The element N forms ccp and atoms of M occupy a third of tetrahedral voids. What is the formula of the compound?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

A compound is formed by 2 elements M and N. The element N forms ccp and atoms of M occupy a third of tetrahedral voids. What is the formula of the compound?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces. What is the empirical formula for this compound?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

A metal crystallises into two cubic phases , face-centered cubic (fcc) and body centered (bcc) whose unit lengths are $3.5 \;and\;3.0 A^{\large\circ}$ respectively . Calculate the ratio of densities of fcc and bcc.

asked Apr 9, 2014 by sharmaaparna1

1 answer

Cu metal crystallises in face centered cubic lattice with cell edge , a = 361.6 pm . What is the density of Cu crystal ? (Atomic mass of copper = 63.5 amu , $N_A = 6.023\times10^{23}$

asked Apr 9, 2014 by sharmaaparna1

1 answer

The density of crystalline sodium chloride is $2.165g cm^{-3}$ . What is the edge length of the unit cell.

asked Apr 9, 2014 by sharmaaparna1

1 answer

Silver crystallises in a face centered cubic unit cell . The density of Ag is $10.5 g cm^{-3}$. Calculate the edge length of the unit cell .

asked Apr 8, 2014 by sharmaaparna1

1 answer

What is the pressure of HCl gas at $-40^{\large\circ}C$ if its density is $8.0 kgm^{-3}? (R = 8.314 JK^{-1}mol^{-1})$

asked Apr 8, 2014 by sharmaaparna1

1 answer

A sample of gas occupies a volume of 512 mL at $20^{\large\circ}C$ and 74 cm of Hg as pressure . What volume would this gas occupy at STP?

asked Apr 8, 2014 by sharmaaparna1

1 answer

Helium and Argon are monoatomic gases and their atomic weights are 4 and 40 respectively . Under identical conditions, helium will diffuse through a semipermeable membrane

asked Apr 8, 2014 by sharmaaparna1

1 answer

2g of hydrogen diffuses from a container in 10 minutes . How many grams of oxygen would diffuse through the same container in the same time under similiar conditions ?

asked Apr 8, 2014 by sharmaaparna1

1 answer

The time taken for a certain volume of a gas X to diffuse through a small hole is 2 minutes . It takes 5.65 minutes for oxygen to diffuse under the similiar conditions . The molecular weight of X is

asked Apr 8, 2014 by sharmaaparna1

1 answer

If same moles of $O_2$ diffuse in 18 sec and same mole of other gas diffuse in 45 sec then what is the molecular weight of the unknown gas?

asked Apr 8, 2014 by sharmaaparna1

1 answer

The density of a pure substance 'A' whose atoms pack in cubic close pack arrangement is 1g m/cc . If B atoms can occupy tetrahedral voids and all the tetrahedral voids are occupied by 'B' atoms what is the density of resulting solid in gm/cc . [Atomic mass (A) = 30 gm/mol and atomic mass (B) = 50gm/mol]

asked Apr 7, 2014 by sharmaaparna1

1 answer

The root mean square of a gas at 300K is $3\sqrt{R}$. The molar mass of this gas in $Kg mol^{-1}$ is

asked Apr 7, 2014 by sharmaaparna1

1 answer

The $U_{rms}$ of $SO_2 \;at\;27^{\large\circ}C$

asked Apr 7, 2014 by sharmaaparna1

1 answer

The average kinetic energy of 1.6 g $CH_4$ molecules at $27^{\large\circ}C$ is:

asked Apr 7, 2014 by sharmaaparna1

1 answer

The intermolecular forces vanishes among water molecules , then volume occupied by 1.8 g $H_2O(l)$ at STP is

asked Apr 7, 2014 by sharmaaparna1

1 answer

The intercept of plots of log V vs log T curves at constant pressure P for 1 mole gas will be

asked Apr 7, 2014 by sharmaaparna1

1 answer

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